I got to picking up papers apprehensively - much as one would lift a desired blanket which he had some idea might have a rattlesnake under it. One day this met my eye:
1）much as 如何理解？
2）...which he had some idea might have a rattlesnake under it. 中的he had some idea是什么成分？即：which might have a rattlesnake under it. 这里的成分搞不懂。
much as 可以是复合连词，引导让步状语从句。但这里显然不是让步关系。所以这里为副词much 修饰 as, as引导比较分句，much as在此大约等于just as, 就像...一样。
这个定语从句为嵌入式定语从句，I had some idea被说话人用作 I knew . which在I knew的宾语从句中作主语。或者说which在 I had some idea 后的同位语从句中作主语。
I dont know you are his brother.
I have no idea you are his brother.
